The dilemma for the synthesis of covalent organic frameworks(COFs)is crystallinity and stability.Herein,we present the synthesis of a single-crystalline amide-linked COF,and demonstrate its excellent chemical as well ...The dilemma for the synthesis of covalent organic frameworks(COFs)is crystallinity and stability.Herein,we present the synthesis of a single-crystalline amide-linked COF,and demonstrate its excellent chemical as well as thermal stabilities.This study will inspire the synthesis of a wide spectrum of highly crystalline and stable COFs,promote their structure-property investigations and boost their applications in selective gas adsorption,storage and separation.展开更多
A core feature of two-dimensional covalent organic frameworks is crystallinity, but it remains challenging to gain their thin films with high crystallinity. Here, we presented growth of thin films of two-dimensional c...A core feature of two-dimensional covalent organic frameworks is crystallinity, but it remains challenging to gain their thin films with high crystallinity. Here, we presented growth of thin films of two-dimensional covalent organic frameworks with an average domain size of ~2.83 μm^(2) and maximum domain size of up to ~26.19 μm^(2) using amphiphilic glycine derivatives on water surface. We envisage that this work will inspire the growth of a wide variety of organic two-dimensional materials with high crystallinity and boost their structure property investigations.展开更多
Chiral covalent organic frameworks(COFs)have shown promising applications in asymmetric catalysis,enantiomer separation and chiral recognition due to their tunable structures and permanent porosity.Currently,synthesis...Chiral covalent organic frameworks(COFs)have shown promising applications in asymmetric catalysis,enantiomer separation and chiral recognition due to their tunable structures and permanent porosity.Currently,synthesis of chiral COFs mainly relies on direct-synthesis method which requires asymmetric monomers to polymerize and crystallize with symmetric monomers and post-synthesis method which has been greatly limited to having complete reactions with the micro-/meso-sized pores of COFs.Recently,the synthesis of two-dimensional COFs by covalent replacement of chiral competitor has been reported.Herein,we present the synthesis of three types of 3D COFs with tunable chirality using chiral amino acid derivative surfactant as inducer in water under ambient conditions.The hydrogen bonds and electrostatic interactions between amino acid derivative surfactant and monomers as well as their precursors facilitate the transfer of the chirality.展开更多
基金We thank financial support from National Natural Science Foundation of China(52061135103 and 52173296)Structure characterizations were supported by Instrumental Analysis and Research Center of Sun Yat-sen University.
文摘The dilemma for the synthesis of covalent organic frameworks(COFs)is crystallinity and stability.Herein,we present the synthesis of a single-crystalline amide-linked COF,and demonstrate its excellent chemical as well as thermal stabilities.This study will inspire the synthesis of a wide spectrum of highly crystalline and stable COFs,promote their structure-property investigations and boost their applications in selective gas adsorption,storage and separation.
基金support from the National Natural Science Foundation of China(52061135103,52173296 and 51833011).
文摘A core feature of two-dimensional covalent organic frameworks is crystallinity, but it remains challenging to gain their thin films with high crystallinity. Here, we presented growth of thin films of two-dimensional covalent organic frameworks with an average domain size of ~2.83 μm^(2) and maximum domain size of up to ~26.19 μm^(2) using amphiphilic glycine derivatives on water surface. We envisage that this work will inspire the growth of a wide variety of organic two-dimensional materials with high crystallinity and boost their structure property investigations.
基金supported by the National Natural Science Foundation of China(52061135103,51873236,52203287)Fundamental Research Funds for the Central Universities,Sun Yat-sen University(No.23yxqntd002).
文摘Chiral covalent organic frameworks(COFs)have shown promising applications in asymmetric catalysis,enantiomer separation and chiral recognition due to their tunable structures and permanent porosity.Currently,synthesis of chiral COFs mainly relies on direct-synthesis method which requires asymmetric monomers to polymerize and crystallize with symmetric monomers and post-synthesis method which has been greatly limited to having complete reactions with the micro-/meso-sized pores of COFs.Recently,the synthesis of two-dimensional COFs by covalent replacement of chiral competitor has been reported.Herein,we present the synthesis of three types of 3D COFs with tunable chirality using chiral amino acid derivative surfactant as inducer in water under ambient conditions.The hydrogen bonds and electrostatic interactions between amino acid derivative surfactant and monomers as well as their precursors facilitate the transfer of the chirality.
